To answer this question, you need to understand the concept of variables and identifiers.
Option A) Identifiers - This option is incorrect because identifiers are names used to identify variables, functions, or other entities in a program. While identifiers can describe the data stored at a memory location, not all identifiers necessarily do so.
Option B) Constant variables - This option is incorrect because constant variables are variables whose values cannot be changed once they are assigned. The naming of constant variables does not necessarily describe the data stored at a memory location.
Option C) Floating point variables - This option is incorrect because floating point variables are variables that can store decimal numbers. The naming of floating point variables does not necessarily describe the data stored at a memory location.
Option D) Mnemonic variables - This option is correct because mnemonic variables are variables with names that describe the data stored at a particular memory location. Mnemonic variables are often used to make the code more readable and understandable.
The correct answer is D) mnemonic variables. This option is correct because mnemonic variables have names that describe the data stored at that particular memory location.